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[6], 27, [1] p., [1] leaf of plates : ill. ; 22 cm. (4to) "The machine referred to by the author as a maquina de dilatação e contracção is a ladder for fireman... According to the etching before the title page the invention is based on good mechanical principles..." (Moraes) Topics: CPJCB, Ladders, Fire prevention, Imprint 1792